In the 1950's, dream researchers commonly thought that dreams were predominantly
a black and white phenomenon, although both earlier and later treatments
of dreaming presume or assert that dreams have color. The first half of
the twentieth century saw the rise of black and white film media, and it
is likely that the emergence of the view that dreams are black and white
was connected with this change in media technology. If our opinions about
basic features of our dreams can change with changes in technology, it
seems to follow that our knowledge of the phenomenology of our own dreams
is much less secure than we might at first have thought it to be.

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